AN829 datasheet(8/9 Pages) STMICROELECTRONICS

8 / 9 page

AN829 APPLICATION NOTE

8/9

junction temperature to be accurately estimated:

with :

Vin = 220Vac/Iin = 8Arms

Vout = 400Vdc/Rgn = 0Ω

MOSFET+DIODE conduction losses = 10W

MOSFET+DIODE commutat. losses = .52W/kHz

with:

Vin = 120Vac/Iin = 15Arms

Vout = 400Vdc/Rgn = 0Ω

MOSFET+DIODE conduction losses = 40W

MOSFET+DIODE commutat. losses = .88W/kHz

with a gate drive resistance Rgn=102, 25% must be

added to the commutation losses.

Figure 5. Current & Voltage Recorders-

Figure 6. Average Current & Voltage-

Figure 7. Average Current & Voltage-

Figure 8. Turn Off Mosfet behavior-

Figure 9. Diode Recovery Current

CURRENT AMPLIFIER

OUTPUT (1V/DIV)

VOLTAGE ERROR OUTPUT

(1V/DIV)

RECTIFIED MAINS

VOLTAGE(50V/DIV)

INSTANTANEOUS INDUCTOR

CURRENT (2A/DIV)

D95IN256A

1msec DIV

AVERAGE CURRENT

AMPLIFIER OUTPUT

(1VDIV)

VOLTAGE ERROR

OUTPUT (1V/DIV)

RECTIFIED MAINS

VOLTAGE (50V/DIV)

AVERAGE INDUCTOR

CURRENT (2A/DIV)

D95IN257A

1msec DIV

RECTIFIED MAINS

VOLTAGE 50V/DIV

AVERAGE INDUCTOR

CURRENT 5A/DIV

D95IN265A

1msec DIV

TURN OFF SOURCE

CURRENT (5A/DIV)

TURN OFF DRAIN

VOLTAGE 50V/DIV(-100V offset)

D95IN266A

D95IN267A

20nsec DIV

5A/DIV

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